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20220218 22 Grant SWMP · MCU22/0172
Site Catchment Areas for DRAINS Modelling Project number: 20220218 Calculations: B. Parry Street Address: 22 Grant St Locality: Noosa Heads, NSC Date: 5/09/2022 Existing Site Existing Site Directly connected (m²) Indirectly connected (m²) 22 Grant St Roof 129.9 129.9 - Impervious Ground 105.5 - 105.5 Driveway 21.5 21.5 - Total Imp 256.9 151.4 105.5 Total Per 337.8 - 337.8 Site Area 594.7 151.4 105.5 % impervious Effective DCIA = 75% DCIA ICIA +25% ineffective DCIA 113.6 143.4 Impervious 43.2% 19.1% 24.1% Pervious 56.8% Proposed Site Proposed Directly connected (m²) Indirectly connected (m²) 22 Grant St Roof 197.2 197.2 - Impervious Ground 161.7 161.7 Driveway 75.2 75.2 Total Imp 434.1 272.4 161.7 Total Per 160.6 - 160.6 Site Area 594.7 272.4 322.3 % impervious Effective DCIA = 75% DCIA ICIA +25% ineffective DCIA 204.3 229.8 Impervious 73.0% 34.4% 38.6% Pervious 27.0%
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